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Electrolyte Stability in Vanadium Flow Batteries

Published online by Cambridge University Press:  26 June 2018

D. Noel Buckley ,
Daniela Oboroceanu ,
Nathan Quill ,
Catherine Lenihan ,
Deirdre Ní Eidhin  and
Robert P. Lynch
D. Noel Buckley*
Affiliation:
Department of Physics, Bernal Institute, University of Limerick, Ireland Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland OH, USA
Daniela Oboroceanu
Affiliation:
Department of Physics, Bernal Institute, University of Limerick, Ireland
Nathan Quill
Affiliation:
Department of Physics, Bernal Institute, University of Limerick, Ireland
Catherine Lenihan
Affiliation:
Department of Physics, Bernal Institute, University of Limerick, Ireland
Deirdre Ní Eidhin
Affiliation:
Department of Physics, Bernal Institute, University of Limerick, Ireland
Robert P. Lynch
Affiliation:
Department of Physics, Bernal Institute, University of Limerick, Ireland Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland OH, USA
*
*(Email: [email protected])
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Abstract

The stability of VFB catholytes was investigated using both light-scattering measurements and visual observation. V2O5 precipitates after an induction time τ which shows an Arrhenius variation with temperature. The value of τ increases with increasing [S] and with decreasing [VV] but the activation energy remains constant with a value of (1.791±0.020) eV. Plots of ln τ against [S] and [VV] show good linearity and the slopes give values of βS = 2.073 M-1 and βV5 = –3.434 M-1 for the fractional rates of variation of τ with [S] and [VV], respectively. Combining the Arrhenius Equation with the observed log-linear variation of τ with [S] and [VV] provides a model for simulating the stability of catholytes. The addition of H3PO4 has a strong stabilizing effect on catholytes at higher temperatures. For example, at 50°C the induction time for precipitation for a typical catholyte is enhanced ∼ 12.5-fold by 0.1 M added H3PO4. At concentrations of H3PO4 less than ∼0.04 M, the precipitation time increases with increasing concentration at all temperatures investigated (30–70°C). At higher concentrations, induction time begins to decrease with increasing concentration of H3PO4: the changeover concentration depends on the temperature. Experiments at 70°C using other phosphate additives (sodium triphosphate, Na5P3O10, and sodium hexametaphosphate, (NaPO3)6) showed similar results to H3PO4.

Keywords

energy storageenvironmentkineticsmodeling
Type
Articles
Information
MRS Advances , Volume 3 , Issue 54: Energy Materials and Technologies , 2018 , pp. 3201 - 3212
Copyright
Copyright © Materials Research Society 2018 

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